Interactions rework discussion

[Chew]

Per the PR in #45 and JDA's PR, we need to make some changes.

In the PR so far, a SlashCommandEvent was added that "wraps" JDA's class. It simply extends it, so all of its methods work from it.

This does mean we could integrate OptionHelper into that class, by simply bringing it over and removing the event parameter.

Is this the best way to handle it? Not really sure what to do here.